Homebrew PCBs

I too found that group to be fairly in active. That's why I joined here ... looks like there is life/activity here....

Im still looking for a printer for direct resist printing ... .im going to try a method I read about that after you print you heat the pcb to aprox 200deg for 5a min to set the ink ...

I was hopeful to find a comprehensive list .... but im missing it if it exists.

Mike KC7NOA 


--- In Homebrew_PCBs@yahoogroups.com, "Boman33" <boman33@...> wrote:
>
> Thanks Steve for replying.
> 
> I also did ask the question on the Inkjet_PCB_Construction but there were no
> replies.  Most work there appears to be aimed at direct printing on PCBs vs.
> creating an artwork and using photo resist.
> 
>  
> 
> Your Amiga comment brings back memories of the original Amiga that I had.
> 
>  
> 
> If color management is disabled in Windows and the printer driver, how can I
> find an RGB value for each of the CMY colors?
> 
>  
> 
> I have spent the last day and a half measuring resolution and ink densities
> for different materials, settings on two different printers and some
> interesting and surprising info has been learned:
> 
> In some cases, even if "gray scale" is selected the printer regardless uses
> color.
> 
> For some paper types the gray scale option is not available.
> 
> For some combinations the UV density is much worse than the visible spectrum
> density.
> 
> Bertho
> 
> ====================================
> 
> From: AlienRelics   Sent: Sunday, October 09, 2011 09:33
> Shouldn't we be having this discussion on Inkjet_PCB_Construction?
> 
> Yes, all printers use CMYK or an expanded version. The most common are a
> light version of Cyan and Magenta, sometimes a "photo" black that may be a
> grey. They are usually indicated by lower-case letters such as CcMyYKk. Some
> expensive printers have additional colors, green and orange as they can be
> very hard colors to hit correctly. Some printers have additional shades of
> grey. These are all to avoid the appearance of visible ink dots in light and
> evenly colored areas, widen the color gamut (range of shades printable), and
> to avoid color and texture shifts.
> 
> RGB only works for additive things like monitors. CMYK is subtractive. Add
> 100% Red, Green, and Blue on a screen and you get white, add the maximum
> Cyan, Magenta, Yellow, and Black and you get Black. Try mixing paints in
> Red, Green, and Blue, and you'll find there are many shades you can never
> get. Green and Blue only add to yellow if you are mixing light. Mix inks or
> paints, Green and Blue become a muddy dark green-blue color.
> 
> The confusion likely stems from the fact that the printer driver for desktop
> printers only accepts files in RGB color space, then converts them to the
> printer ink color space. CMYK, CcMmYKk, etc.
> 
> Separations won't help you - the separation, if printed on your home
> printer, will still be just an image file that will be printed as if it were
> an RGB color space file in black, which gets converted by the printer drive
> to the printer CMYK color space.
> 
> Using CMYK within Photoshop can help a little, but ultimately all files
> printed first get converted to RGB before getting sent to the printer
> driver.
> 
> What you really need is a RIP, but those tend to be expensive. There is
> Turboprint Studio, which I've not used since I had it on my Amiga 3000, but
> there is a version for Linux. The Amiga version of TurboPrint Studio 2 let
> you control every ink, so you could set it to print only in one particular
> ink.
> http://www.turboprint.info/
> 
> I see the programmer has a version for Windows and Mac called PrintFab.
> Appears to still be in beta testing.
> http://www.printfab.com/en/
> 
> You could also find a color in RGB that prints mostly magenta and/or cyan.
> 
> BTW, the C82 is not a "photo" printer in the meaning of having the lighter
> color inks such as photo cyan and photo magenta. It is a four color CMYK
> printer. Still, the printer driver only accepts RGB image files and does the
> conversion to the printer's CMYK inkset.
> 
> Steve Greenfield AE7HD
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>